WO2004020132A1 - Procede de et outillage pour degrossissage de moules, et moules obtenus ainsi obtenus - Google Patents

Procede de et outillage pour degrossissage de moules, et moules obtenus ainsi obtenus Download PDF

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Publication number
WO2004020132A1
WO2004020132A1 PCT/EP2003/009182 EP0309182W WO2004020132A1 WO 2004020132 A1 WO2004020132 A1 WO 2004020132A1 EP 0309182 W EP0309182 W EP 0309182W WO 2004020132 A1 WO2004020132 A1 WO 2004020132A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutter
moulds
pass
chip
leading angle
Prior art date
Application number
PCT/EP2003/009182
Other languages
English (en)
Inventor
Donatella Assali
Original Assignee
Ctm Di Assali Donatella
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ctm Di Assali Donatella filed Critical Ctm Di Assali Donatella
Priority to AU2003255462A priority Critical patent/AU2003255462A1/en
Publication of WO2004020132A1 publication Critical patent/WO2004020132A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B23C5/109—Shank-type cutters, i.e. with an integral shaft with removable cutting inserts

Definitions

  • the subject of the present invention is a process for carrying out the roughing of moulds, the tools able to carry out this process and the obtained moulds following this process or by employing such means.
  • the present invention relates to the construction of injection moulds for plastics for the manufacturing of accessories for the transportation industry; injection moulds for plastics for the manufacturing of electric and electronic goods; injection moulds for plastics for the manufacturing of various products, packaging and alike; extrusion moulds of every type of material suitable to be extruded for the manufacturing of profiles of any type and any section; blowing moulds; vacuum moulds; compression mould; moulds for the manufacturing of rubber objects for the footwear industry; moulds for the manufacturing of tyres; moulds for the industrial manufacturing of rubber objects of every type and for any use; moulds for the manufacturing of glass objects by means of pressure; moulds for the manufacturing of glass objects by means of glass- blowing; moulds for the manufacturing of object pieces by means of melting; moulds for the manufacturing of object pieces by means of shell melting; moulds for the production of pieces or objects, in which
  • pre- hardened steel is employed for the manufacturing of the moulds. That is to say, steel is used that has previously been subjected to hardening treatment, so as to obtain the desired hardness, and once the steel has such hardness, the steel pieces are worked by chip removal tools until the same pieces have the shape of the desired mould.
  • the objective of the present invention is to eliminate all the draw-backs related to the known processes and applied and deriving from the employment of the cutter known to date and used for the manufacturing of the moulds.
  • the inventor as a result of her ingenious intuition, has thought-up a new process and a new cutter able to carry out the same process, so that the said cutter is exposed to a loading for the most part coaxial to the axis of the bar, i.e. in the direction of its maximum stress resistance. That is the resistance to the compression.
  • Such process and cutter also allow the radial loading on the cutter to be very small, negligible, i.e. in the way of its minimum stress resistance that is to the flexo-torsion.
  • the diameter of the cutters employed being the same, they can double both the number of turns of the new cutter, and the feed speed of the table, of the machine tool, which carries the mould afoot. Furthermore it is possible to increase both the pressure of the mould against the cutting edge of the cutter, and the cutting pitch.
  • the diameter of the cutters being the same, doubles the weight of the produced chip, doubles the production, and furthermore the cutting machine can take place without the continuous presence of the operator.
  • the cutting edges of the new cutter are in sintered tungsten carbide and are head sharpened, from the axis until the circumference of the bar, in order to also have a lower rake.
  • the more acute the frontal leading angle of the cutting edge of the cutter the greater the number of turns of the cutter itself, and the feed speed of the table of the machine tool, which carries the mould under construction.
  • Another essential characteristic, both of the process according to the present invention and of the cutter according to the present invention that serves to achieve said new process, consists in that the teeth of the cutter are sharp and cutting along the whole of their length, i.e. from the axis of the bar until the circumference of the same bar.
  • the cutter, according to the present invention can be monolithic, or assembled with an insert in the shape of a spear, almost flattened, i.e. with two joined and sharp sides along the whole of their length, i.e. from the axis of the corner until the outer end at an acute leading angle.
  • the process that forms object of the present invention can be carried out with the already known machine tools and equipments, mounting the cutter on the mandrel which also forms the object of the invention.
  • the cutter that forms the object of the present invention can be used with an engagement along a 220° arch rather than along a 190° arch as is possible, as a maximum, with the known to date processes and cutters. Besides this, it is necessary to program the size of the pass so that it is the same or slightly smaller to the existing difference of level between the central bit of the cutting edge, i.e.
  • the size of the pass must be equal or lower to the existing difference of level between the lower internal end of the cutting rim of the cutter' s tooth and the higher outer end of the cutting edge of the cutter itself.
  • Figure 1 illustrates a schematic assembly of the already known roughing process of the so called 90° frontal leading angle type by means of so called "candle" cutter.
  • Figure 2 illustrates a schematic assembly of the already known roughing process of the so called 40° frontal leading angle by means of the so called "toric" cutter.
  • Figure 3 illustrates a schematic assembly of the roughing process according to present invention and of the cylindrical monolithic cutter, according to the present invention too, able to achieve the same process, i.e. at acute leading angle.
  • Figure 4 illustrates in greater scale and in greater detail the same assembly as illustrated in figure 3 for the roughing by means of acute leading angle.
  • Figure 5 illustrates a plan taken from below the cylindrical monolithic cutter of figure 4, looking upwards .
  • Figure 6 illustrates again what has been illustrated in figure 4, however in a more schematic way, as to indicate the diagram of the forces operating on the toothed free end of the cylindrical monolithic cutter with acute leading angle according to the present invention.
  • Figure 7 illustrates in perspective the toothed end of the cylindrical monolithic cutter with teeth at acute leading angle.
  • Figure 8 illustrates, with a frontal view, an assembly of a cutter 17, also to carry out the process according to the present invention, however, unlike that of monolithic ones illustrated in the previous figures, it is of the so called "assembled" type, i.e. composed of one shank with a bracket shaped lower end in which, by means of a screw 18, an insert 19 is fixed.
  • the insert 19 is composed of a slab of tungsten carbide with coverings that are suitable for the tools and having the corner in the shape of a spear with two sharp teeth in the same direction at an acute leading angle 20.
  • the cutter 17 is unlike the monolithic cutter illustrated above mainly for its replaceability of the teeth-tools 19 in the form of a slab. Also the leading angle 20 is of 10°.
  • the mould 1 can be seen, fixed on the machine tool table, moving together with it in the direction of the arrow, whilst a candle cutter 2 turns and cuts off the chip at a 90° leading angle 3.
  • the mould 1 can be seen again, fixed on the machine tool table, moving with it in the direction of the arrow, whilst a toric cutter 4 turns and cuts off the chip at a 40° leading angle 5.
  • the mould 1 can again be seen, fixed on the machine tool table, moving with it in the direction of the arrow, whilst a cylindrical monolithic cutter 6, of the type that forms the objective of the present invention, is carrying out the process that also forms the objective of the present invention.
  • the said cylindrical monolithic cutter 6 turns and cuts off the chip at a 10° leading angle 7.
  • the cylindrical monolithic cutter 6 has two teeth 8 and 9, however the number of the teeth could also be different and still remain within the scope of the present invention.
  • the tooth 8 has the cutting edge 10 and the tooth 9 has the cutting edge 11.
  • the force 12 can be seen that applies on the tooth of the cutter 6 whilst cutting off the chip at a 10° leading angle has as a resultant the force 13, applying on it a 10° inclined plane.
  • the said resultant force 13 can be considered as decomposed in two orthogonal forces between them: the greater force 14 operating in a coaxial direction to the axis of the cutter 6 and the lesser force 15 operating in a radial direction to the cylindrical monolithic cutter 6 itself.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)

Abstract

le moule (1) est fixé sur le plateau d'une machine-outil avançant en direction de la flèche vers une fraise (6) qui tourne à grande vitesse. Les dents (8) de la fraise ont un angle d'attaque de 10° (7).
PCT/EP2003/009182 2002-08-27 2003-08-19 Procede de et outillage pour degrossissage de moules, et moules obtenus ainsi obtenus WO2004020132A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003255462A AU2003255462A1 (en) 2002-08-27 2003-08-19 Process for the roughing of moulds, tools to achieve such process and moulds obtained with such process and such means

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVA20020044 ITVA20020044A1 (it) 2002-08-27 2002-08-27 Procedimento per la sgrossatura degli stampi, utensili
ITVA/2002/A/000044 2002-08-27

Publications (1)

Publication Number Publication Date
WO2004020132A1 true WO2004020132A1 (fr) 2004-03-11

Family

ID=31972243

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/009182 WO2004020132A1 (fr) 2002-08-27 2003-08-19 Procede de et outillage pour degrossissage de moules, et moules obtenus ainsi obtenus

Country Status (3)

Country Link
AU (1) AU2003255462A1 (fr)
IT (1) ITVA20020044A1 (fr)
WO (1) WO2004020132A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130177362A1 (en) * 2009-12-22 2013-07-11 Emanuele Cigni Mill and method of use

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2400856A (en) * 1943-07-16 1946-05-21 Pipe Machinery Company Cutting tool
US2621548A (en) * 1948-06-02 1952-12-16 Warren W Williams Mounting for cutting tools
GB1008701A (en) * 1963-06-21 1965-11-03 John William Downer Improved slot-cutting tool
JPH0283108A (ja) * 1988-09-19 1990-03-23 Sumitomo Electric Ind Ltd 金型のリブ成形溝加工用エンドミル
US5125775A (en) * 1987-11-20 1992-06-30 Starrfrasmaschinen Ag Method for machining a workpiece by end-face cutting tool
US6007281A (en) * 1998-04-09 1999-12-28 Novator Ab Method of producing holes in fiber reinforced composites using a tool with a cutting head having an enlarged diameter and reduced height

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2400856A (en) * 1943-07-16 1946-05-21 Pipe Machinery Company Cutting tool
US2621548A (en) * 1948-06-02 1952-12-16 Warren W Williams Mounting for cutting tools
GB1008701A (en) * 1963-06-21 1965-11-03 John William Downer Improved slot-cutting tool
US5125775A (en) * 1987-11-20 1992-06-30 Starrfrasmaschinen Ag Method for machining a workpiece by end-face cutting tool
JPH0283108A (ja) * 1988-09-19 1990-03-23 Sumitomo Electric Ind Ltd 金型のリブ成形溝加工用エンドミル
US6007281A (en) * 1998-04-09 1999-12-28 Novator Ab Method of producing holes in fiber reinforced composites using a tool with a cutting head having an enlarged diameter and reduced height

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 277 (M - 0985) 15 June 1990 (1990-06-15) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130177362A1 (en) * 2009-12-22 2013-07-11 Emanuele Cigni Mill and method of use
US9296051B2 (en) * 2009-12-22 2016-03-29 Nuovo Pignone S.P.A. Mill and method of use

Also Published As

Publication number Publication date
ITVA20020044A1 (it) 2004-02-28
AU2003255462A1 (en) 2004-03-19

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